Portion of a spyglass



FIG. 1 is a front, side and top perspective view of a portion of a spyglass, showing our new design;

FIG. 2 is an opposite side view thereof; and,

FIG. 3 is a top view thereof.

The features shown in broken lines depict environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a spyglass, as shown and described. 